Electrical Engineering

I have a 4-20 mA digital air pressure regulator which is controlled by and reports its pressure by being the current sink in two independent 4-20 mA current loops.

I've ran into numerous roadblocks in trying to develop a converter or circuit to allow us to adapt to this regulator which sinks instead of sources current. For example, we've unsuccessfully attempted to add a simple opamp + BJT circuit to act as a repeater of sorts.

Researching this further, I've been trying to determine what the correct terminology would be for a circuit that fulfills this purpose.

Would a "current-dependent current source" (CDCS?) be the correct circuit for this? (I've also seen "current-controlled current source (CCCS).) Is a "current mirror" the same thing? Does the terminology change when the controlling-side current is sinked (sunk?) by an external device versus within the CDCS itself?

is a duplicate

This question has been asked before and has already been answered. It should be marked as a duplicate.

Please enter the URL of the proposed duplicate in the details field below.

not constructive

This question cannot be answered in a way that is helpful to anyone. It's not possible to learn something from possible answers, except for the solution for the specific problem of the asker.

Communities

Comments on Is a current-dependent current source and a current mirror the same thing?

Is a current-dependent current source and a current mirror the same thing?

2 comment threads